Save a Failed Idol's Life - Chapter 189:

Freely traverse between the city and the abyss, cultivate a demon legion! Command demonic talents!My name is Bai Yan, from that day on... one of my souls possesses two identities.I am a demon! Also a human!When I am good, I benefit the world! When I am evil, there are corpses everywhere!

Shao Xuan joins a friend in his expedition to a recently discovered archaeological cave. After he picks up an ordinary looking stone he is teleported to a different world and wakes up in the body of a small orphan child. The world he is in now is still in its stone age with primitive tools made of stone and the ways of the people are savage. Savage isn’t the only thing special about the people though, because they have superhuman strength, jump higher than trees and punch stones. In short, they are able to cultivate their bodies. Despite all this, it is a real struggle to survive because of the scarcity of food. Together with Caesar, his pet wolf, he tries to survive in this cruel world.

- Description from novelupdates

Traveling through the world of Naruto, he is just a four-year-old boy who has no talent, no family, no blood, and no tailed beast.

Unexpectedly, after completing the Jain test, the system suddenly awakened.

Since then, he has drawn the glittering fruit, the shaking fruit, the dragon-killing magic crystal of fire, the magic eye of death, Geass, the blood of the ancestor giant, the eye of reincarnation, the eternal kaleidoscope writing wheel eye…

Also, Demon Sword Muramasa, Death Note, Longinus Spear, Godzilla, Zanpakutō*Kyoka Suizuki, Zanpakutō*River Blade, Natural Teeth…

- Description from novelbuddy

[Warning: Mature Content]

“Master, are we going to keep what happened last night a secret between us?”

“For how loud you moaned and cried, Qing-er, I think the whole world has already learned all about it, and your concern is irrelevant.”

Yun Qing-er, the only disciple of the legendary immortal swordmaster Bai Ye, has been hiding her feelings for her master for years. Unaccepted by norms and morals, it is the darkest secret that she swears to bury deep within her heart.

But life has other plans. Bai Ye's desire for her burns hot beneath his solemn appearance. He will teach her not only the art of the sword, but also the pleasures of life that she never knew existed before.

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Smut starts at Chapter 17, with a teaser in Chapter 11. A bit softcore at first but will get wilder quickly as the story moves on :)

Note that this is NOT a typical cultivation romance. Immortals and spiritual power and whatnot are all plot devices… You'll see what I mean in just a few chapters!

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[Sneak Peek]

He pinned me against the poplar tree at the center of the garden. A breeze rustled past, stirring the sunlight sparkling through the autumn foliage above us, and a sprinkle of gold fell over his shoulders. “Say you want me,” he whispered.

“Bai Ye—” I breathed, but the rest of my words were replaced by moans the moment he traced his kisses along my neck and took my earlobe into his mouth.

Familiar tingles roared through me as he nibbled and suckled gently. His hand slid up my chest, and he played with my sensations with his lips and tongue and fingers until my arms trembled around him. All other thoughts vanished from my mind. The only thing I knew was the irresistible feeling of him on me, so overwhelming that my knees started growing weak. I would've fallen if he wasn't pinning me hard against the tree.

“Bai Ye …” I moaned again, clawing at his clothes. “Of course I want you … Right here, right now.”

He let out a soft puff of laughter, and his hand grazed down, gripping the folds of my dress. With a rip of fabric, he tore them away.